Carl kuehn



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CARL KUEHN, OF VIENNA, AUSTRIA, ASSIGNOR To JOSEPH R. VON

WESSELY, OF NEW YORK .G1IY.-'

Lia Patent No. 77, 987, dated May 19,1868.

f rurno-vnn' MODEOP UTILIZING TIN-SCRAP on WASTE, 7

TO ALL WHOM IT MAY CCNCERN:

Be it known that I, CAnI. KUEHN, of the city of Vienna, i n the Empire of Austria, have invehted or dis covered a new and improved Method of Utilizing Tinned-Iron Waste, ofn'hich the'following is a full, clear, and exact description. i 1 It is the object of my invention to obtain from the scraps of tinned iron which accumulate around tin. shops, and are usually thrown away, both tin and iron, in such forms of respectively seg're'gated purity that they may be used for their ordinary purposes. And to this end iny invention consists First, in a novel method, hereinafter described, of separating the tin from the iron, by digesting the scraps in hot water, mixed with muriatic acid and nitric acid.

7 Second, in a novel method, hereinafter described, of -reduoingthe'tin thus retrieved to a metallic form, by immersing zinc plates in the solution, so as to excite galvanic action.

Third, in a novel method, hereinafter described, of segregating the tin from the iron by the employment of heat, water, muriatic and nitric acids, evaporation, crystallization, and galvanic action.

In order to carry out the objects of my invention, I place thescraps of tinned iron in a copper cauldron, set in proper masonryfovera furnace, and cover them with water. I when the water boils, about twenty-five per cent of muriatic acidflhnd two and a half per cent. of nitric acid to each hundred pounds of waste, is poured into the cauldron. Thisseparates the'tin from the iron. .When no particles of tin are seen to cling to the iron, the latteris taken out. and is at once fitfor producing weldahl'e i1:on,by simply heating and working it under a hammer, or passing it through suitable rolls.

The liquid is left in the cauldron,'more scraps are thrown in, together .with the same proportions, as the} acids above mentioned, and the operation above dcscribedre'peated. This process is continued until the liquid in the cauldron has become saturated with tin, or chloride of tin,.the\vater is then evaporated, leaving in the cauldron a residuum, and a portion of the tin held in solution isdeposited in the format crystals of chloride of tin and chloride ofiron, which the liquid holds in solution.

The chloride of tin thus obtained by crystallization is fit for the market; but in order to produce metallic tin from the solution, the saturated cold liquid (chloride of tin and chloride of iron) above mentionedfis placed in a wooden vessel, in which'zinc plates' are suspended Galvanic action is thus excited, and the tin held in solution in the liquid is deposited on the plates, whence it is removed at intervals and the plates replaced. This operation is continued until tin ceases to be'deposited on the plates,

' The'tin'thus saved is pressed into cakes, meltedwith pitchin cast-iron cauldrons, and cast into suitable forms in proper moulds. V I

Besides the tin,'therc are some other products utilizedby this process, such as muriate of ammonia, in a solid as well as a liquid condition, to be manipulated in the usual way.

F What I claim as my invention, and desire to secure by Letters Patent, is

'1. The method hereiudescribed of u'tiliz'ingtinned-iron waste by digesting the waste in -ho t water, in combination with muriatic and nitric acids, substantially as set forth.

2. The method, herein described, of collecting the'inetallic tin from the solution herein described, by means of zinc plates immersed therein, and euciting galvanic action. to cause the tin to be deposited on the plates, asset forth. r p

3. The method, herein described, of segregating the tin and the iron by means of heat, water, muriatie and. nitric acids, evaporation; crystallization, and galvanic action.

CARL KUEHN. Witnesses:

Gusrnvu BOLESLARVSKI,

FRANCIS Eons. 

